@misc{IM2_1975_9_2_a11,
     title = {Petr {Sergeevich} {Novikov} (obituary)},
     journal = {Izvestiya. Mathematics},
     pages = {441--442},
     year = {1975},
     volume = {9},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1975_9_2_a11/}
}